Screening and magnetic separation system for scrap metal and screening and magnetic separation method of screening and magnetic separation system

Abstract

The waste metal screening and magnetic separation system comprises a bottom plate and a supporting frame fixedly arranged on the top face of the bottom plate through supporting legs, a transmission roller and a permanent magnet roller are rotationally arranged on the two sides of the surface of the supporting frame correspondingly, and a first conveying belt is in transmission connection between the surface of the transmission roller and the surface of the permanent magnet roller. A collecting frame is fixedly arranged on one side of the top face of the bottom plate, L-shaped flow guide plates are fixedly arranged on the two sides of the interior of the collecting frame, and a second conveying belt is in transmission connection between the interiors of the two L-shaped flow guide plates. According to the waste metal screening and magnetic separation system and the screening and magnetic separation method thereof, magnetic metal fragments collected after magnetic separation can be rapidly screened according to the particle size, and in the screening process, the screening net plate is locally vibrated by the local vibration mechanism according to the blocking degree in the meshes, so that rapid discharging of the fragments is facilitated, and the screening speed is increased.

Description

Technical Field

[0001] The invention relates to the technical field of scrap metal processing, in particular to a scrap metal screening and magnetic separation system and a scrap metal screening and magnetic separation method. Background Art

[0002] Scrap metal refers to metal fragments and scraps discarded by the metallurgical industry and metal processing industry, as well as metal objects scrapped during equipment renewal. It also includes metal packaging containers and scrapped vehicles recycled from urban garbage. Scrap metal is also a resource. Countries around the world have specialized units engaged in the recycling and utilization of scrap metal businesses. The recycled scrap metal is mainly used for smelting and converted into recycled metal, and some is used to produce machinery and equipment or parts, tools and civilian appliances.

[0003] According to the patent application number CN202110835353.3, when the motor drives the active shaft to rotate, the conveyor belt will be driven in the direction of the permanent magnetic roller. At the same time, the reciprocating assembly will drive the distributor to move horizontally, so that the mineral material can be evenly scattered on the surface of the conveyor belt to prevent the mineral material on the conveyor belt from piling up into strips and unevenly distributed. In addition, the vibration assembly will vibrate the mineral material on the conveyor belt. When the mineral material is vibrated, the magnetic particles are adsorbed by the magnetic block and distributed in the lower layer and close to the surface of the conveyor belt. Since the mineral material is evenly distributed on the conveyor belt and the magnetic particles are distributed below the mineral material layer and close to the conveyor belt, when the mineral material is transported to the permanent magnetic roller, the magnetic particles inside the mineral material are more fully adsorbed by the permanent magnetic roller, avoiding uneven distribution of the mineral material. The magnetic particles are mixed above the mineral material layer and cannot be fully adsorbed by the permanent magnetic roller, resulting in poor magnetic separation effect. When the device in the above patent is used to magnetically separate scrap metal fragments, the magnetic metal is directly output for collection after magnetic separation, but is not screened according to the particle size of the magnetic metal fragments, which affects the subsequent classification and utilization. Subsequent manual screening is time-consuming and labor-intensive, which affects the recycling of magnetic metals. Therefore, in view of the above shortcomings, the present invention makes the following improvements. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides a scrap metal screening and magnetic separation system and a scrap metal screening and magnetic separation method thereof, which solve the problems mentioned in the background technology.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a scrap metal screening magnetic separation system, comprising a bottom plate, a support frame fixedly arranged on the top surface of the bottom plate through support legs, a transmission roller and a permanent magnetic roller are rotatably arranged on both sides of the surface of the support frame, and a first conveyor belt is connected in a transmission manner between the surfaces of the transmission roller and the permanent magnetic roller, a collection frame is fixedly arranged on one side of the top surface of the bottom plate, and L-shaped guide plates are fixedly arranged on both sides of the interior of the collection frame, a second conveyor belt is connected in a transmission manner between the interiors of the two L-shaped guide plates, a screening mesh plate is arranged on the top surface of the second conveyor belt, and a local vibration mechanism is arranged between the L-shaped guide plates; The local vibration mechanism includes a wave plate fixedly arranged between two L-shaped guide plates, and a sliding ring is arranged on the top surface of the wave plate, the sliding ring is located in a recessed part of the top surface of the wave plate, a movable rod is rotatably arranged in the middle part of the sliding ring, a lifting ball is fixedly arranged on the top surface of the movable rod through a fixed column, and a control part for driving the lifting ball to move is arranged on the bottom surface of the screening mesh plate.

[0008] Preferably, the control unit includes a motor fixedly arranged on the surface of one of the L-shaped guide plates, a screw rod is rotatably arranged between the opposite sides of the two L-shaped guide plates, and one end of the screw rod is fixedly connected to one end of the motor output shaft through a coupling, a sliding plate is threadedly connected to the surface of the screw rod, a guide rod is fixedly arranged between the opposite sides of the two L-shaped guide plates, and a connecting plate is slidably arranged on the surface of the guide rod, and a through groove matching the movable rod is opened inside the connecting plate and the sliding plate.

[0009] Preferably, a scraper is fixedly provided on one side of the top surface of the collection frame, a push plate is provided on one side of the collection frame, a hydraulic cylinder is fixedly provided on the top surface of the bottom plate through a vertical rod, and the protruding end of the hydraulic cylinder is fixedly connected to one side of the push plate, and a movable door is provided on the other side of the collection frame.

[0010] Preferably, a placement groove is provided on the top surface of the second conveyor belt and between the two sides of the two L-shaped guide plates, and a fixing box is fixedly provided on both sides of the placement groove, a limiting mechanism is provided inside the fixing box, and the limiting mechanism includes an insert block movably provided inside the fixing box, and slots matching the insert blocks are provided on both sides of the screening mesh plate.

[0011] Preferably, an electromagnet is fixedly provided on one side of the inner wall of the fixing box, an iron block is fixedly provided on one side of the plug block located inside the fixing box, and one side of the inner wall of the fixing box is fixedly connected to the surface of the plug block via a buffer spring.

[0012] Preferably, a sealing plate is provided between the two L-shaped guide plates and on the surface of the second conveyor belt, and a collecting box is movably provided on the bottom surface of the local vibration mechanism.

[0013] Preferably, a feed hopper is fixedly provided on the top surface of the support frame via a vertical plate, a flat diversion mechanism is provided on the surface of the first conveyor belt, and the flat diversion mechanism includes a vibrating part and a diversion plate fixedly provided on the bottom surface of the feed hopper via a connecting block, first electric push rods are fixedly provided on the front and back of one side of the feed hopper, a baffle is fixedly provided between the protruding ends of the two first electric push rods, and a finishing brush is provided on the bottom surface of the baffle.

[0014] Preferably, the vibration part includes a support plate arranged inside the support frame, and a second electric push rod is fixedly arranged on the top surface of the support plate, a movable frame is fixedly arranged on the protruding end of the second electric push rod, and a lifting cylinder is rotatably arranged inside the movable frame.

[0015] The present invention also discloses a method for magnetic separation of scrap metals, which specifically comprises the following steps: S1. When the scrap metal is transported to the permanent magnetic roller along the first conveyor belt, the non-magnetic metal fragments are directly thrown into the collection box due to the centrifugal effect, while the magnetic metal fragments are attached to the surface of the first conveyor belt due to the adsorption effect of the permanent magnetic roller and rotate downward with the permanent magnetic roller. When the magnetic metal fragments attached to the first conveyor belt are away from the permanent magnetic roller, the magnetic attraction force on the magnetic metal fragments is weakened, and the magnetic metal fragments are scraped into the collection box in cooperation with the setting of the scraper; S2. The magnetic metal fragments entering the collection frame are screened by the screening mesh plate. During the screening process, the screening mesh plate is locally vibrated by a local vibration mechanism according to the degree of blockage, so that the magnetic metal fragments are quickly screened according to the aperture size on the screening mesh plate and collected uniformly through the collection box.

[0016] The present invention provides a scrap metal screening magnetic separation system and a scrap metal screening magnetic separation method, which have the following beneficial effects:

[0017] (1) The scrap metal screening magnetic separation system and the scrap metal screening magnetic separation method can quickly screen the magnetic metal fragments collected after magnetic separation according to the particle size, and during the screening process, the local vibration mechanism locally vibrates the screening mesh plate according to the degree of blockage in the mesh, so as to facilitate the rapid discharge of the fragments and improve the screening speed.

[0018] (2) The scrap metal screening magnetic separation system and the scrap metal screening magnetic separation method can control the second conveyor belt to transmit the screening mesh plate to the front of the collection frame when the screening mesh plate is worn and needs to be replaced, thereby facilitating the replacement operation of the screening mesh plate and improving work efficiency.

[0019] (3) The scrap metal screening magnetic separation system and the scrap metal screening magnetic separation method can flatten and arrange the scrap metal fragments dropped from the feed hopper through the setting of the flattening and diversion mechanism, and cooperate with the setting of the vibration part to separate the fragments as much as possible to avoid the scrap metal fragments from gathering into strips, thereby creating good conditions for the subsequent magnetic separation effect of the scrap metal fragments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A three-dimensional diagram of the structure of the present invention; Figure 2 It is a right view of the collecting frame structure of the present invention; Figure 3 For the present invention Figure 2 A cross-sectional view of the structure; Figure 4 It is a structural schematic diagram of the local vibration mechanism of the present invention; Figure 5 A top view of the internal structure of the fixing box of the present invention; Figure 6 For the present invention Figure 1 A partial enlarged view of point A in the middle.

[0021] In the figure: 1. support frame; 2. transmission roller; 3. permanent magnet roller; 4. first conveyor belt; 5. collection frame; 6. L-shaped guide plate; 7. local vibration mechanism; 71. wave plate; 72. sliding ring; 73. movable rod; 74. lifting ball; 75. motor; 76. screw rod; 77. sliding plate; 78. guide rod; 8. limit mechanism; 81. plug block; 82. electromagnet; 83. iron block; 84. buffer spring; 9. flat diversion mechanism; 91. diversion plate; 92. first electric push rod; 93. baffle; 94. finishing brush; 95. second electric push rod; 96. movable frame; 97. lifting cylinder; 10. second conveyor belt; 11. screening mesh plate; 12. scraper; 13. push plate; 14. hydraulic cylinder; 15. movable door; 16. collection box; 17. fixed box; 18. collection box; 19. feed hopper. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Embodiment 1

[0024] See also Figures 1 to 4 As shown, the present invention provides a technical solution, and the specific improvements are as follows: A scrap metal screening magnetic separation system, comprising a bottom plate, a support frame 1 fixedly arranged on the top surface of the bottom plate by support legs, a driving roller 2 and a permanent magnetic roller 3 are rotatably arranged on both sides of the surface of the support frame 1, and a first conveyor belt 4 is connected between the surfaces of the driving roller 2 and the permanent magnetic roller 3, and an external control motor drives the driving roller 2 to rotate. This is a prior art and is not described in detail in this application document. A collecting frame 5 is fixedly arranged on one side of the top surface of the bottom plate, and a collecting frame 5 is movably arranged on the top surface of the bottom plate and on one side of the collecting frame 5. The collecting frame 5 is provided with a scraper 12 fixedly disposed on one side of the top surface thereof, and the magnetic metal on the first conveyor belt 4 can be scraped off by the scraper 12. The collecting frame 5 is provided with an L-shaped guide plate 6 fixedly disposed on both sides of the inside thereof, and a second conveyor belt 10 is connected to the inside of the two L-shaped guide plates 6 by transmission. The transmission operation of the second conveyor belt 10 is a prior art, and is not described in detail in this application document. The top surface of the second conveyor belt 10 is provided with a screening mesh plate 11, and the screening mesh in the middle of the screening mesh plate 11 is made of an elastic material. A local vibration mechanism 7 is arranged between the two L-shaped guide plates 6, and the local vibration mechanism 7 includes a wave plate 71 fixedly arranged between the two L-shaped guide plates 6, and a sliding ring 72 is arranged on the top surface of the wave plate 71, and the sliding ring 72 is located in the concave part of the top surface of the wave plate 71, and a movable rod 73 is rotatably arranged in the middle of the sliding ring 72, and a lifting ball 74 is fixedly arranged on the top surface of the movable rod 73 through a fixed column, and a control part for driving the lifting ball 74 to move is arranged on the bottom surface of the screening mesh plate 11, and the control part includes a fixed A motor 75 is fixedly arranged on the surface of one of the L-shaped guide plates 6, a screw rod 76 is rotatably arranged between the opposite sides of the two L-shaped guide plates 6, and one end of the screw rod 76 is fixedly connected to one end of the output shaft of the motor 75 through a coupling, a sliding plate 77 is threadedly connected to the surface of the screw rod 76, a guide rod 78 is fixedly arranged between the opposite sides of the two L-shaped guide plates 6, and a connecting plate is slidably arranged on the surface of the guide rod 78, and a through groove adapted to the movable rod 73 is opened inside the connecting plate and the sliding plate 77; When the scrap metal is transported to the permanent magnetic drum 3 along the first conveyor belt 4, the non-magnetic metal fragments will be directly thrown into the collection box 16 due to the centrifugal effect, and the magnetic metal fragments will be attached to the surface of the first conveyor belt 4 due to the adsorption effect of the permanent magnetic drum 3, and rotate downward with the permanent magnetic drum 3. When the magnetic metal fragments attached to the first conveyor belt 4 are away from the permanent magnetic drum 3, the magnetic attraction force on the magnetic metal fragments is weakened, and the magnetic metal fragments are scraped into the collection frame 5 by the scraper 12. In the process of unloading, the two L-shaped guide plates 6 guide them and discharge them into the top surface of the screening mesh plate 11; The magnetic metal fragments are screened by the screening mesh plate 11. Large pieces of magnetic metal fragments remain on the top surface of the screening mesh plate 11, while fragments with smaller particles fall into the collecting box 18 through the screening mesh plate 11. During the screening process, the motor 75 is started to drive the screw rod 76 to rotate. The screw rod 76 can drive the sliding plate 77 to move left and right during the rotation, and control the sliding plate 77 to move to the right. The movable rod 73 moves synchronously. Due to the mutual adaptation of the sliding ring 72 and the wave plate 71, the movable rod 73 can be synchronously moved up and down inside the sliding plate 77 and the connecting plate, and the fixed column drives the lifting ball 74 to move up and down synchronously, thereby vibrating the bottom surface of the screening net up and down, and can be vibrated and dredged when the screening net is partially blocked. Targeted treatment can improve the screening efficiency of the fragments.

[0025] Embodiment 2

[0026] Based on Example 1, please refer to Figures 1 to 3 The specific improvements are as follows: A push plate 13 is provided on one side of the collection frame 5, a hydraulic cylinder 14 is fixedly provided on the top surface of the bottom plate through a vertical rod, and the extended end of the hydraulic cylinder 14 is fixedly connected to one side of the push plate 13, a movable door 15 is provided on the other side of the collection frame 5, a sealing plate is provided between the two L-shaped guide plates 6 and on the surface of the second conveyor belt 10, and a collection box 18 is movably provided on the bottom surface of the local vibration mechanism 7; After the screening is completed, the collection box 16 is taken out, and then the collection box 18 is taken out, which can facilitate the subsequent processing of the small-particle magnetic metal fragments. The hydraulic cylinder 14 is started, so that the extended end of the hydraulic cylinder 14 drives the push plate 13 to move, and the movable door 15 is opened. The large-particle fragments on the top surface of the screening mesh plate 11 can be pushed out by the push plate 13 and collected by the external box body.

[0027] Embodiment 3

[0028] Based on Example 2, please refer to Figure 3 and Figure 5 The specific improvements are as follows: A placement groove is provided on the top surface of the second conveyor belt 10 and between the two sides of the two L-shaped guide plates 6, and a fixing box 17 is fixedly provided on both sides of the placement groove, a limiting mechanism 8 is provided inside the fixing box 17, and the limiting mechanism 8 includes an insert block 81 movably provided inside the fixing box 17, and slots adapted to the insert block 81 are provided on both sides of the screening mesh plate 11, an electromagnet 82 is fixedly provided on one side of the inner wall of the fixing box 17, an iron block 83 is fixedly provided on one side of the insert block 81 located inside the fixing box 17, and one side of the inner wall of the fixing box 17 is fixedly connected to the surface of the insert block 81 through a buffer spring 84; When replacing the screening mesh panel 11, control the transmission of the second conveyor belt 10 until the screening mesh panel 11 is transmitted to the front of the collecting frame 5, and then control the external control switch to energize the electromagnet 82 to generate magnetism, which can adsorb the iron block 83. At this time, the plug block 81 moves to the inside of the fixing box 17, thereby releasing the limit fixation of the screening mesh panel 11, and personnel can replace it. After replacement, place the screening mesh panel 11 inside the placement slot, control the electromagnet 82 to cut off the power, and then the plug block 81 is inserted into the slot on the screening mesh panel 11 under the action of the buffer spring 84 to be fixed.

[0029] Embodiment 4

[0030] Based on Example 3, please refer to Figure 1 and Figure 6 The specific improvements are as follows: A feed hopper 19 is fixedly provided on the top surface of the support frame 1 through a vertical plate, a flattening and diverting mechanism 9 is provided on the surface of the first conveyor belt 4, and the flattening and diverting mechanism 9 includes a vibrating portion and a diverter plate 91 fixedly provided on the bottom surface of the feed hopper 19 through a connecting block, a first electric push rod 92 is fixedly provided on the front and back of one side of the feed hopper 19, and a baffle 93 is fixedly provided between the protruding ends of the two first electric push rods 92, a finishing brush 94 is provided on the bottom surface of the baffle 93, the vibrating portion includes a support plate provided inside the support frame 1, and a second electric push rod 95 is fixedly provided on the top surface of the support plate, a movable frame 96 is fixedly provided on the protruding end of the second electric push rod 95, and a lifting cylinder 97 is rotatably provided inside the movable frame 96; The scrap metal fragments fall onto the top surface of the first conveyor belt 4 through the feed hopper 19, and are divided into two groups by the diverter plate 91. The first electric push rod 92 is started, and the baffle plate 93 is driven to rise and fall by the extended end of the first electric push rod 92. In combination with the transmission of the first conveyor belt 4 and the arrangement of the finishing brush 94, the diverted fragments can be flattened and sorted. At the same time, the second electric push rod 95 is started, and the extended end of the second electric push rod 95 is controlled to drive the lifting cylinder 97 to move up and down through the movable frame 96, so as to vertically vibrate the first conveyor belt 4. Under the action of vibration, the scrap metal fragments are further flattened and separated from each other, which can improve the magnetic separation effect of subsequent fragments.

[0031] Embodiment 5

[0032] See also Figures 1 to 6 As shown, the present invention also discloses a method for magnetic separation of scrap metals, which specifically comprises the following steps: S1. When the scrap metal is transported to the permanent magnetic roller 3 along the first conveyor belt 4, the non-magnetic metal fragments are directly thrown into the collection box 16 due to the centrifugal effect, and the magnetic metal fragments are attached to the surface of the first conveyor belt 4 due to the adsorption effect of the permanent magnetic roller 3, and rotate downward with the permanent magnetic roller 3. When the magnetic metal fragments attached to the first conveyor belt 4 are away from the permanent magnetic roller 3, the magnetic attraction force on the magnetic metal fragments is weakened, and the magnetic metal fragments are scraped into the collection frame 5 in cooperation with the setting of the scraper 12; S2. The magnetic metal fragments entering the collecting frame 5 are screened by the screening mesh plate 11. During the screening process, the screening mesh plate 11 is locally vibrated by the local vibration mechanism 7 according to the degree of blockage, so that the magnetic metal fragments are quickly screened according to the aperture size on the screening mesh plate 11 and are uniformly collected by the collecting box 18.

[0033] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A scrap metal screening magnetic separation system, comprising a bottom plate, a support frame (1) fixedly arranged on the top surface of the bottom plate by support legs, a driving roller (2) and a permanent magnetic roller (3) being rotatably arranged on both sides of the surface of the support frame (1), and a first conveyor belt (4) being drivingly connected between the surfaces of the driving roller (2) and the permanent magnetic roller (3), characterized in that: A collecting frame (5) is fixedly arranged on one side of the top surface of the bottom plate, and L-shaped guide plates (6) are fixedly arranged on both sides of the inside of the collecting frame (5); a second conveyor belt (10) is transmission-connected between the insides of the two L-shaped guide plates (6); a screening mesh plate (11) is arranged on the top surface of the second conveyor belt (10); and a local vibration mechanism (7) is arranged between the L-shaped guide plates (6); The local vibration mechanism (7) comprises a wave plate (71) fixedly arranged between two L-shaped guide plates (6), and a sliding ring (72) is arranged on the top surface of the wave plate (71), and the sliding ring (72) is located in a recessed position on the top surface of the wave plate (71). A movable rod (73) is rotatably arranged in the middle of the sliding ring (72), and a lifting ball (74) is fixedly arranged on the top surface of the movable rod (73) via a fixing column. A control unit for driving the lifting ball (74) to move is arranged on the bottom surface of the screening mesh plate (11), and the control unit comprises a control unit fixedly arranged on one of the two L-shaped guide plates (6). A motor (75) is provided on the surface of the L-shaped guide plate (6), a screw rod (76) is rotatably provided between the two opposite sides of the L-shaped guide plates (6), and one end of the screw rod (76) is fixedly connected to one end of the output shaft of the motor (75) through a coupling, a sliding plate (77) is threadedly connected to the surface of the screw rod (76), a guide rod (78) is fixedly provided between the two opposite sides of the L-shaped guide plates (6), and a connecting plate is slidably provided on the surface of the guide rod (78), and a through groove matching the movable rod (73) is provided inside the connecting plate and the sliding plate (77).

2. A scrap metal screening and magnetic separation system according to claim 1, characterized in that: A scraper (12) is fixedly provided on one side of the top surface of the collection frame (5), a push plate (13) is provided on one side of the collection frame (5), a hydraulic cylinder (14) is fixedly provided on the top surface of the bottom plate via a vertical rod, and an extended end of the hydraulic cylinder (14) is fixedly connected to one side of the push plate (13), and a movable door (15) is provided on the other side of the collection frame (5).

3. The scrap metal screening magnetic separation system according to claim 1, characterized in that: A placement groove is provided on the top surface of the second conveyor belt (10) and between the two sides of the two L-shaped guide plates (6), and a fixing box (17) is fixedly provided on both sides of the placement groove. A limiting mechanism (8) is provided inside the fixing box (17), and the limiting mechanism (8) includes an insert block (81) movably provided inside the fixing box (17), and slots matching the insert block (81) are provided on both sides of the screening mesh plate (11).

4. A scrap metal screening and magnetic separation system according to claim 3, characterized in that: An electromagnet (82) is fixedly provided on one side of the inner wall of the fixed box (17), an iron block (83) is fixedly provided on one side of the plug block (81) located inside the fixed box (17), and one side of the inner wall of the fixed box (17) is fixedly connected to the surface of the plug block (81) via a buffer spring (84).

5. The scrap metal screening and magnetic separation system according to claim 1, characterized in that: A sealing plate is provided between the two L-shaped guide plates (6) and on the surface of the second conveyor belt (10), and a collecting box (18) is movably provided on the bottom surface of the local vibration mechanism (7).

6. The scrap metal screening and magnetic separation system according to claim 1, characterized in that: A feed hopper (19) is fixedly arranged on the top surface of the support frame (1) via a vertical plate, a flattening and diverting mechanism (9) is arranged on the surface of the first conveyor belt (4), and the flattening and diverting mechanism (9) comprises a vibrating portion and a diverting plate (91) fixedly arranged on the bottom surface of the feed hopper (19) via a connecting block, first electric push rods (92) are fixedly arranged on the front and back surfaces of one side of the feed hopper (19), a baffle (93) is fixedly arranged between the protruding ends of the two first electric push rods (92), and a finishing brush (94) is arranged on the bottom surface of the baffle (93).

7. A scrap metal screening and magnetic separation system according to claim 6, characterized in that: The vibration part comprises a support plate arranged inside the support frame (1), and a second electric push rod (95) is fixedly arranged on the top surface of the support plate, a movable frame (96) is fixedly arranged on the protruding end of the second electric push rod (95), and a lifting cylinder (97) is rotatably arranged inside the movable frame (96).

8. A method for magnetic separation of scrap metals, characterized in that: The specific steps include: S1. When the scrap metal is transported to the permanent magnetic roller (3) along the first conveyor belt (4), the non-magnetic metal fragments are directly thrown into the collection box (16) due to the centrifugal effect, while the magnetic metal fragments are attached to the surface of the first conveyor belt (4) due to the adsorption effect of the permanent magnetic roller (3) and rotate downward along with the permanent magnetic roller (3). When the magnetic metal fragments attached to the first conveyor belt (4) are away from the permanent magnetic roller (3), the magnetic attraction force on the magnetic metal fragments is weakened, and the magnetic metal fragments are scraped into the collection box (5) in cooperation with the setting of the scraper (12); S2. The magnetic metal fragments entering the collecting frame (5) are screened by the screening mesh plate (11). During the screening process, the screening mesh plate (11) is locally vibrated by the local vibration mechanism (7) according to the degree of blockage, so that the magnetic metal fragments are quickly screened according to the aperture size on the screening mesh plate (11) and are uniformly collected by the collecting box (18).

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